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block: fix NULL pointer dereference in register_disk

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If __device_add_disk-->bdi_register_owner-->bdi_register-->
bdi_register_va-->device_create_vargs fails, bdi->dev is still
NULL, __device_add_disk-->register_disk will visit bdi->dev->kobj.
This patch fixes that.

Signed-off-by: zhengbin <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
zhengbin 2019-02-20 21:27:05 +08:00 • committed by Jens Axboe
commit 4d7c1d3fd7
1 changed files with 6 additions and 4 deletions
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10
block/genhd.c
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@ -655,10 +655,12 @@ exit:
kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD);
disk_part_iter_exit(&piter);
err = sysfs_create_link(&ddev->kobj,
&disk->queue->backing_dev_info->dev->kobj,
"bdi");
WARN_ON(err);
if (disk->queue->backing_dev_info->dev) {
err = sysfs_create_link(&ddev->kobj,
&disk->queue->backing_dev_info->dev->kobj,
"bdi");
WARN_ON(err);
}
}
/**